You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1023 B
Python
44 lines
1023 B
Python
2 years ago
|
import abc
|
||
|
|
import threading
|
||
|
|
|
||
|
|
from collections import UserList
|
||
|
|
|
||
|
|
|
||
|
|
class Freezable(metaclass=abc.ABCMeta):
|
||
|
|
def __init__(self):
|
||
|
|
self._frozen = False
|
||
|
|
|
||
|
|
@property
|
||
|
|
def frozen(self) -> bool:
|
||
|
|
return self._frozen
|
||
|
|
|
||
|
|
def freeze(self):
|
||
|
|
self._frozen = True
|
||
|
|
|
||
|
|
|
||
|
|
class Signal(UserList, threading.Event):
|
||
|
|
def __init__(self, owner: Freezable):
|
||
|
|
UserList.__init__(self)
|
||
|
|
threading.Event.__init__(self)
|
||
|
|
self._owner = owner
|
||
|
|
self.frozen = False
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return "<Signal owner={}, frozen={}, {!r}>".format(
|
||
|
|
self._owner, self.frozen, list(self)
|
||
|
|
)
|
||
|
|
|
||
|
|
def send(self, *args, **kwargs):
|
||
|
|
"""
|
||
|
|
Sends data to all registered receivers.
|
||
|
|
"""
|
||
|
|
if self.frozen:
|
||
|
|
raise RuntimeError("Cannot send on frozen signal.")
|
||
|
|
|
||
|
|
for receiver in self:
|
||
|
|
receiver(*args, **kwargs)
|
||
|
|
|
||
|
|
self.frozen = True
|
||
|
|
self._owner.freeze()
|
||
|
|
self.set()
|